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• W2059630173 startingPage "93" @default.
• W2059630173 abstract "Four, two, or one L = PEt3 ligands are selectively introduced into the coordination sphere of silica-supported Ni(I) ions. Reflectance and EPR spectra are given. The five-coordinate species NiIL4(Os) are inactive in C2H4 dimerization. The square planar NiIL2(O5)2 and the unsaturated NiIL(Os)2 species are active, stable and selective at 40 °C. The best results are observed with two PEt3 ligands: at a conversion of 23%, a selectivity of 95% for 1-butene is obtained. The turnover rates (v) are about 0.1 s−1. From EPR studies a reaction mechanism is proposed. An intermediate metallacyclopentane is characterized. It is shown that the presence of basic phosphine ligands increases the electron density on nickel and allows an easier desorption of the primary reaction products." @default.
• W2059630173 created "2016-06-24" @default.
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• W2059630173 creator A5039159384 @default.
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• W2059630173 date "1987-11-01" @default.
• W2059630173 modified "2023-10-16" @default.
• W2059630173 title "Dimerization of ethylene into 1-butene over supported tailor-made nickel catalysts" @default.
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• W2059630173 doi "https://doi.org/10.1016/0304-5102(87)87024-4" @default.
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